Jordan and Evermann. — Fishes of North America. 187 



44 to 47 in immber, 12 to 14 in a transverse series. Dorsal fiu rather short 

 and high, with abont 12 rays beginning rather nearer snout than base of 

 caudal. Pectoral fins moderate. Anal high and short, more or less emar- 

 ginate in males. Caudal fin moderately forked, the lobes about C(iual. 

 Air bladder with 2 chambers. Males in spring with the head covered 

 with many small tubercles. This genus is intermediate between Erimi/zon 

 and Moxostoma, differing from the latter mainly in the structure of its 

 air bladder, {iiivvq, reduced; rpf/^a, aperture; in allusion to the imper- 

 fections of the lateral line.) 



a. Dark streaks along rows of scales evident; Bcales 7^6-G. melanops, 303. 



303. MINTTREMA MELANOPS, (Rafinesquo). 

 (Winter Suckeh ; Spotted Sucker.) 



Body oblong, little compressed, the young nearly terete, the adults 

 deeper ; depth about 4 in length, varying from about 3 in adults to 4^ in 

 the young. Head not very large, 4*^ in length of body (IJ to 4^), not 

 specially depressed. Mucous pores rather strong. Eye small, 5 to 6 iu 

 head. Scales large, firm, regularly and smoothly imbricated, in 46 (44 to 

 47) longitudinal series, and 13 (12 to 14) transverse series, the scales not 

 crowded forward. Fin rays usually, D. 12; A. 7 ; V. 9. Coloration 

 dusky above, with usually a black blotch behind the dorsal fin ; each 

 scale along the sides with a small, more or less distinct blackish spot at 

 its base, these spots forming interrupted longitudinal lines along the rows 

 of scales ; these lines are usually very distinct, especially in the adult, 

 but young specimens often show them faintly; sides and belly silvery, 

 with a coppery luster. Sexual peculiarities moderately marked ; very 

 old males with the head covered with small tubercles in spring ; no great 

 change with age, either in form or coloration. Size large ; maximum 

 length about 18 inches. Great Lake region to North Carolina (Cape Fear 

 River) and west to Texas ; rather common westward. {fifJag, black ; oiiji, 

 appearance.) 



Catostomus mekmo^ni, KafinesqI'E, Ichtli. Oh., 57, 1820, Ohio River. 



Caiostomus fasciatns Le Sueir, in Cuvier & Valenciennes, xvii, 449, 1844, Mississippi River. 

 Caloslomiisfasciatus, Gvnther, Cat., vii, 19,1808; Jordan, Bull. V. S. Nat. Mus. xii, 138,1878. 

 Minjjlremamelnnops, Jonj)AT< & Gilbest, Synopsis, 130,1883. 



Moxostoma Victoria:, Girard, Proc. Ac. Nat. Sci. Phila., 185G, 171, Dry Creek, Victoria, Texas. 

 Ptijchostomns haiideni, Girard, Z. c, 1850, 172, Yellowstone River; Missouri River at Fort 

 Pierre, Nebraska. (Type, No. 20203.) 



97. MOXOSTOMA, Rafinesque. 

 (Red Horse.) 



Moxostoma, Rafinesqite, Ichth. Oh., 54, 1820, (anisnrus). 



Teretiilus, Rafinesque, /. c, .'57, 1820, (anreohiit). 



Plychoslonms, AoASSlz, Am. Jour. Sci. Arts, 1855, 203, {anreolns). 



Body more or less elongate, sometimes nearly terete, usually more or 

 less compressed. Head variously long or short, its length 3i to 5* in that 

 of the body. Eye usually rather large, from 3 to 6 times in the length of 

 the head. Suborbital bones very narrow. Fontanelle always well oiien. 

 Mouth varying much in size, always inferior iu position, the mandible 



